CN1164875A - Hot-rolled steel sheet and process for producing the same - Google Patents
Hot-rolled steel sheet and process for producing the same Download PDFInfo
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- CN1164875A CN1164875A CN96190986A CN96190986A CN1164875A CN 1164875 A CN1164875 A CN 1164875A CN 96190986 A CN96190986 A CN 96190986A CN 96190986 A CN96190986 A CN 96190986A CN 1164875 A CN1164875 A CN 1164875A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/227—Surface roughening or texturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
Abstract
A steel material comprising 0.001 to 0.20 wt.% C, 0.01 to 0.50 wt.% Si, 0.05 to 2.0 wt.% Mn, at most 0.05 wt.% P, at most 0.05 wt.% S, 0.01 to 0.10 wt.% sol. Al, and at most 0.020 wt.% N with the balance consisting of Fe and unavoidable impurities is heated to the Ac3 point or above, subjected to rough rolling at a termination temperature ranging from (Ar3 point + 100 DEG C) to (Ar3 point + 50 DEG C), then subjected to ultrahigh-pressure descaling under the conditions satisfying requirements of impact pressure of 25 kgf/cm<2> or more and a liquid density of 0.002 l/m<2> or more, subsequently subjected to finish rolling within 5 sec after the descaling under the conditions of reduction ratio of at least 80 % and rolling termination temperature of Ar3 point or above, and coiled at 700 DEG C or below to produce a hot-rolled sheet having a surface roughness Ra of at most 0.8 mu m and an average scale thickness of at most 4 mu m. The hot-rolled sheet thus obtained has improved adhesion when it is formed with a black scale deposited thereon and can offer an improved pickling efficiency.
Description
Technical field
The present invention relates to hot-rolled steel sheet, particularly only carry out hot rolling or carry out cold rolling again and steel plate and manufacture method thereof that use.The present invention relates to a kind ofly have surface roughness Ra below 0.8 μ m, the hot-rolled steel sheet and the manufacture method thereof of the average thin oxide skin of scale thickness below 4 μ m, above-mentioned steel plate adds man-hour oxide skin at band casting skin state (hot-rolled state) and peels off fewly, and pickling efficient is good when being used for pickling.
Background technology
Generally be by continuous metal cast process or ingot casting method and the steel billet that obtains is made hot-rolled steel sheet with hot rolling.Can be created on 2 oxide skins of what is called that produce in the hot rolling on the hot-rolled steel sheet top layer that obtains like this, its thickness is about 5 μ m～15 μ m, by FeO-Fe
3O
4-Fe
2O
33 layers of formation.
(the hot-rolled steel sheet surface has casting skin) form at band casting skin state and to add man-hour, thereby the part of above-mentioned 2 oxide skins that generate on the hot-rolled steel sheet surface can be peeled off and be polluted processing line, and the oxide skin of peeling off can become and is pressed into scar, thereby causes the surface imperfection of processing back product.Therefore, in the past, the processing of the hot-rolled steel sheet of belt leather is only limited to the slightest situation carry out.
Therefore, under the situation of the raw material that uses hot-rolled steel sheet to carry out the processing of aximal deformation value or use, need manage to remove descaling by pickling process as cold-rolled steel sheet.In this case, there is such problem in the prior art promptly: consider that from the reason of material aspect when the coiling temperature after the hot rolling reached high temperature more than 550 ℃, the oxide skin at steel plate edge can thickening, produces from FeO to Fe
3O
4The variation of+Fe, thus phenomenons such as oxide skin densification appear making, make the load of pickling decrease in efficiency and production line become very big.
Therefore, for alleviating the above-mentioned various harm that oxide skin is brought, attempted the multiple effort that is used for attenuate oxide skin so far.
For example, such method is disclosed in the fair 6-104853 communique of spy: behind the steel even heating to 1150 that contains Si:0.02～0.2%, Cr:0.02～0.2% ℃, start from below 1000 ℃, end at below 860 ℃ and draft is rolling more than 90%, batching said steel below 500 ℃.
In addition, as the method for in hot rolling, removing descaling, for example the spy opens and discloses a kind of like this method in the flat 4-238620 communique: when the steel grade that generates difficult spalling oxide skin being carried out hot rolling with the manufacturing hot-rolled steel sheet, before the finish rolling high pressure spraying jet of water is being removed oxide skin to surface of steel plate, the jet pressure of high pressure spraying water per unit distribution area is 20～40g/mm
2, flow is 0.1～0.2l/minmm
2
But disclosed method has coiling temperature after the hot rolling in the restriction below 500 ℃ in the fair 6-104853 communique of above-mentioned spy, considers from the viewpoint of material, exists not to be suitable for the problem that coiling temperature need surpass 500 ℃ steel grade.
In addition, though above-mentioned spy opens in the flat 4-238620 communique disclosed method and can remove most of oxide skin, but can not Ex-all contain the oxide skin that enters matrix structure that has that produces in the steel grade of more Si, this just has through rolling and produce the problem of the squama scar that is called as red oxide skin.In addition, only implementing this method differs in addition and obtains the problem of thin oxide skin surely fully.
Moreover, can only reach Ra by any surfaceness of the steel plate of these prior art manufacturings is about 1～3 μ m, supplying with under the state of casting skin is shaped to add can not get enough plasticities (sliding) and adaptation man-hour having, on the contrary, when after carrying out pickling, being used, damage the problem of pickling in addition.
Therefore, main purpose of the present invention is to provide a kind of hot-rolled steel sheet and manufacture method thereof that does not have the existing problem of above-mentioned hot-rolled sheet oxide skin.
Another object of the present invention provides a kind of manufacture method that successfully is applicable to the thin oxide skin hot-rolled steel sheet that ultra-high voltage descales.
A further object of the present invention provide a kind of average scale thickness in thin oxide skin below the 4 μ m and surfaceness (Ra) hot-rolled steel sheet and the manufacture method thereof below 0.8 μ m, even under the high situation of coiling temperature, perhaps contain this method under the more situation of Si and bring difficulty also can not for processing and pickling efficient under the band casting skin state.
Disclosure of an invention
The contriver mainly is conceived to the condition that descales before finish rolling, study with keen determination repeatedly, finally realized above-mentioned purpose, for achieving the above object, adopt the unexistent so far ultra-high voltage technology that descales, therefore can improve the oxide skin proterties of surface of steel plate greatly, thereby finish the present invention.That is:
(1) the present invention is a kind of hot-rolled steel sheet, and it contains:
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
All the other compositions are Fe and unavoidable impurities, and the average scale thickness in surface is below the 4 μ m, and surfaceness (Ra) is below the 0.8 μ m.
(2) the present invention is a kind of hot-rolled steel sheet, and it contains
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And contain a kind or two kinds
The heavy % of Ti:0.10 is following, Nb:0.10 weighs below the %
All the other compositions are Fe and unavoidable impurities, and the average scale thickness in surface is below the 4 μ m, and surfaceness (Ra) is below the 0.8 μ m.
(3) the present invention is a kind of hot-rolled steel sheet, and it contains
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And, contain
Below the heavy % of B:0.0100
All the other compositions are Fe and unavoidable impurities, and the average scale thickness in surface is below the 4 μ m, and surfaceness (Ra) is below the 0.8 μ m.
(4) the present invention is a kind of hot-rolled steel sheet, and it contains
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And, contain a kind or 2 kinds
The heavy % of Ti:0.10 is following, Nb:0.10 weighs below the %
Also contain
Below the heavy % of B:0.0100
All the other compositions are Fe and unavoidable impurities, and the average scale thickness in surface is below the 4 μ m, and surfaceness (Ra) is below the 0.8 μ m.
(5) the present invention is a kind of manufacture method of hot-rolled steel sheet, and this method will contain
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
All the other compositions are that the steel raw material of Fe and unavoidable impurities is heated to Ac
3After point is above, at (Ar
3Point+100 ℃)～(Ar
3Point+50 ℃) finish roughing in the temperature range, then, satisfying jet pressure is 25kgf/cm
2More than and liquid measure density be 0.002 liter/cm
2The ultra-high voltage of above condition descales, then, 5 seconds with interior beginning draft be more than 80%, the rolling temperature of finishing is at Ar
3The finish rolling that point is above then, is being batched below 700 ℃.
(6) the present invention is a kind of manufacture method of hot-rolled steel sheet, and this method will contain
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And, contain from
The heavy % of Ti:0.10 is following, Nb:0.10 weighs below the %
Below the heavy % of B:0.0100
In select more than a kind or 2 kinds, all the other compositions are that the steel raw material of Fe and unavoidable impurities is heated to Ac
3After point is above, at (Ar
3Point+100 ℃)～(Ar
3Point+50 ℃) finish roughing in the temperature range, then, satisfying jet pressure is 25kg f/cm
2More than and liquid measure density be 0.002 liter/cm
2The ultra-high voltage of above condition descales, then, 5 seconds with interior beginning draft be more than 80%, the rolling temperature of finishing is at Ar
3The finish rolling that point is above then, is being batched below 700 ℃.
The simple declaration of accompanying drawing
Fig. 1 is the figure of the average scale thickness relation of expression jet pressure, the water yield and hot-rolled sheet.
Fig. 2 is that the expression back that descales begins the figure of relation of the average scale thickness of institute's elapsed time and hot-rolled sheet to finish rolling.
The optimised form that carries out an invention
Just implementing suitable condition of the present invention below describes.
(1) about composition of steel:
The heavy % in C:0.001～0.20
C guarantees the necessary element of intensity, when it contains quantity not sufficient 0.001 weight %, can not reach the effect of guaranteeing intensity.On the other hand, when surpassing 0.2 heavy %, oxide skin and substrate interface place can produce CO gas, the reason that the squama scar was peeled off and produced to oxide skin occurs thereby become in the operation of rolling, thereby its content is 0.001～0.20 heavy %, are preferably 0.001～0.10 heavy %.
The heavy % in Si:0.01～0.50
Except that being used for deoxidation, Si still is used to improve the element of intensity.When it contains quantity not sufficient 0.01 weight %, there is not any effect.On the other hand, when surpassing the amount of 0.50 heavy %, be easy to generate the such squama scar of red oxide skin,, be preferably 0.01～0.2 heavy % so its content is 0.01～0.5 heavy % as interpolation.
The heavy % in Mn:0.05～2.0
When being used to make as hot-work the solid solution S of embrittlement reason become MnS and finish innoxious, Mn still has the element of the effect that improves intensity.When its quantity not sufficient 0.05 weighs %, there is not any effect.On the other hand, will cause that toughness reduces when add surpassing the amount of 2.0 heavy %,, be preferably 0.05～1.0 heavy % so its content is 0.05～2.0 heavy %.
Below the heavy % of P:0.05
Because can bring bad influence, so P wishes the element that reduces as far as possible to embrittlement of grain boundaries.Owing to when the amount of P weighs % above 0.05, be easy to produce baneful influence,, be preferably below the 0.01 heavy % so its content is below the 0.05 heavy %.Under existing refining techniques condition, because its content is reduced to system steel cost is significantly risen, so its lower limit amount is that 0.001 heavy % is both economical.
Below the heavy % of S:0.05
S is the element that makes hot workability and the obvious deterioration of toughness.Because above-mentioned baneful influence can become greatly when the amount of S weighed % above 0.05, institute is preferably below the 0.01 heavy % so that its content is below the 0.05 heavy %.Under existing refining techniques condition, because its content is reduced to system steel cost is significantly risen, so its lower limit amount is that 0.001 heavy % is both economical.
The heavy % in sol.Al:0.01～0.10
Al is the element that adds as reductor as required.Its amount does not have any effect when sol.Al less than 0.01 weighs %.On the other hand, when add surpassing the amount of 0.10 heavy %, except that cost raises, also can make the steel plate embrittlement, institute is so that its content is 0.01～0.1 heavy %.Consider from cost-effectiveness, be preferably 0.04～0.1 heavy %.
Below the heavy % of N:0.020
Material reinforcement can be helped though initiatively add N, then the steel plate embrittlement can be made as containing too much N element above 0.020 heavy %.Thereby, should add in the scope below 0.02 heavy % as required.Particularly under situation about need not strengthen, preferably making it is below the 0.01 heavy %.Under the condition of existing refining techniques, its content is reduced to system steel cost is enlarged markedly, so its lower limit amount is that 0.001 heavy % is both economical.
The heavy % of Ti:0.10 is following, Nb:0.10 weighs below the %
Ti, Nb are the elements that forms carbonitride.Improving unit elongation, r value or improve intensity by fine carbonitride with the minimizing by solid solution C, N is that purpose is added.Wherein any addition can produce oxide skin and cause occurring the squama scar as surpassing 0.10 heavy %, thereby to make its content be below the 0.10 heavy %, and preferably addition is 0.01～0.06 heavy %.
Below the heavy % of B:0.0100
The decapacitation of B element suppresses total amount when solid solution C and N amount and reduces to the embrittlement of grain boundaries that 0.0005 weight % is produced when following, improves the effect of hardening capacity in addition, can add as required.If steel sclerosis and embrittlement will occur but add the amount that surpasses 0.0100 heavy %, so be below the 0.0100 heavy %, preferably addition is 0.0005～0.0030 heavy %.
(2) about creating conditions
A. the heating of steel can be a solutionization completely before the hot rolling, can be heated to Ac
3More than the point.Particularly, be proper for 1050～1300 ℃ as common slab heating temperature scope.
B. after carrying out above-mentioned heating, carry out hot roughing, descale and carry out hot finishing with high-pressure water.
In these operations, just comprise that the general condensed summary of the particularly important of the present invention that limits reason is as follows.
At first, at (Ar
3Point+100 ℃)～(Ar
3Point+50 ℃) reason of finishing roughing in the scope is, when descaling subsequently, the part by the steel surface obtains surperficial softening and level and smooth surface from γ to the transformation of α, and surface roughness Ra can reach≤0.8 μ m.That is, finish temperature and surpass Ar in roughing
3During point+100 ℃, just under the γ zone state to the top layer processing that descales, so, thereby intensity can uprise and can not get the following surfaceness of Ra:0.8 μ m.On the other hand, as than Ar
3Point+50 are ℃ low, will in the process of descaling, carry out α and change, because of intensity rise a lot, so the roughness that can not obtain stipulating equally.
In thin oxide skin steel plate with the low surface roughness that obtains like this, can remove oxide skin in the short period of time at the utmost point during pickling, the stress concentration in the time of can also suppressing slight viscous deformation obtains very excellent adaptation.
After above-mentioned roughing, carry out that ultra-high voltage descales and finish rolling.In this case, for average scale thickness is controlled at below the 4 μ m, relevant ultra-high voltage descales condition as shown in Figure 1, the jet pressure of surface of steel plate: 25kg f/cm
2More than, liquid measure density: 0.002l/cm
2More than, as shown in Figure 2, descale the back to the time that begins finish rolling 5 seconds with interior be necessary.
Here, total liquid (water) amount that drops on the per unit area of steel plate when liquid measure density is represented to descale is obtained with following formula.
W＝Q·t/A——(1)
Wherein, W: liquid measure density (liter/cm
2)
Q: output (rise/sec)
T: the time (sec) that steel plate stops under spraying
A: be injected in the projected area (cm on the steel plate
2)
Be injected in the projected area A (cm on the steel plate
2) and the time t (sec) that under spraying, stops of steel plate try to achieve by following formula to the distance H (cm) of steel plate with the speed v (cm/sec) of steel plate, the extended corner x (degree) and the injection nozzle of injection nozzle.
If be injected in the projected area A (cm on the steel plate
2) be shaped as the circle that radius is r,
A＝πr
2——(2)
t＝2r/v——(3)
With (2), (3) formula substitution (1),
W＝2Q/(πr·v)——(4)
In addition, because of r=Htan (x/2)---(5)
With (5) formula substitution (4) formula,
W＝2Q/(π·H·tan(x/2)·v)——(6)
That is, can adjust liquid measure density W to the distance H of steel plate by the speed v of output Q, steel plate, the extended corner x and the injection nozzle of injection nozzle.
These conclusions obtain by following experiment.Composition of steel for experiment is the heavy %N of the heavy %Al-0.003 of the heavy %S-0.05 of the heavy %P-0.007 of the heavy %Mn-0.004 of the heavy %Si-0.12 of 0.03 heavy %C-0.01.In addition, slab thickness: 260mm, slab heating temperature: 1150 ℃, roughing 7 roads, finish temperature: 930～970 ℃ of (Ar
3=870 ℃), 610 ℃ of thin slab thickness 40mm, finish rolling 7 roads, 875 ℃ of final rolling temperatures, finish rolling thickness of slab: 3.5mm, coiling temperature.
The steel plate that is die-cut into 36mm φ is come the deoxygenated skin with 20% hydrochloric acid (50 ℃) pickling, and establishing oxide skin proportion is 5.2g/cm
3, the weight difference before and after the pickling calculates the scale thickness of hot-rolled steel sheet.The locating of scale thickness is taken as near each steel band length direction central authorities, width 1/4 position, the measured value in average 5 places and obtaining.
Usually, can obtain the above-mentioned jet pressure p of surface of steel plate when descaling by following formula by the discharge pressure P of nozzle and the distance H between output Q, surface of steel plate and nozzle.[referring to (iron and steel) 1991 vol.77 No.9 p 1454, (4) formula]
p＝5.64PQ/H
2——(7)
Wherein, p: the jet pressure of surface of steel plate (MPa)
P: jet pressure (MPa)
Q: output (liter/second)
H: the distance between surface of steel plate and nozzle (cm)
Among the present invention, though the condition that ultra-high voltage descales and descale the back to time that finish rolling begins to the influencing mechanism and imperfectly understand of final scale thickness, reach 25kg/cm as jet pressure
2Ultra-high voltage, it is concavo-convex and make it smoothing to eliminate the top layer, particularly can suppress the formation of local heavy scale in the recess, and, when water yield density surpasses 0.002 liter/cm
2The time, have only utmost point top layer effectively to be cooled off, in the back obviously generation of inhibited oxidation skin in the time in about 5 seconds that descales, this can be regarded as reason.And in the present invention, the result who particularly limits the roughing condition is that the steel surface roughness in hot rolling intermediate stage is low, and this has been considered to bring and suppresses thereafter oxide skin to the effect of the growth of thickness of slab direction.
The jet pressure that the past high pressure descales is 1.0～4.0kg f/cm
2About, adopt now be equivalent to about 10 times to this ultra-high voltage, therefore, found inconceivable distinctive action effect under the prior art condition in the present invention.
Then, the finish rolling of carrying out after above-mentioned ultra-high voltage descales need be in draft more than 80%, the rolling temperature of finishing at Ar
3Carry out under the above condition of point and batching below 700 ℃.
Reason is, when at not enough Ar
3When being rolled, worked structure being arranged or be formed with undesirable set tissue because of remaining under the situation of point, so material is understood deterioration, when the draft less than 80% of finish rolling, the oxide skin deformation of rolling generation is insufficient, can not generate thin oxide skin.In addition, when coiling temperature surpassed 700 ℃, the oxide skin growth meeting after not only particularly batching in roll end was fairly obvious, and unusual thickization of crystal grain was arranged and the appearance of shortcomings such as material deterioration.
Embodiment
Embodiment 1
The plate slab that contains the heavy % of C:0.0025, the heavy % of Si:0.01, the heavy % of Mn:0.15, the heavy % of P:0.009, the heavy % of S:0.006, the heavy % of sol.Al:0.05, the heavy % of N:0.0027 is heated to after 1150 ℃, at each temperature roughing shown in carry out table 1, make the thin slab of 35mm, then in finish rolling, apply 90% depress and make 3.5mm, under 910 ℃, finish finish rolling (Ar
3=910 ℃).Coiling temperature is 550 ℃.At this moment, make the condition of descaling, the back that descales to the time that finish rolling begins such variation as shown in table 1.The extended corner x of the speed v of the output Q of water, steel plate, injection nozzle and injection nozzle are set 1 liter/second, 40m/nin, 40 degree, 10cm to the distance H of steel plate respectively for as primary condition when descaling, for liquid measure density and the jet pressure that obtains stipulating, change suitable outlet pressure P according to (6) (7) formula, the output Q of water, the speed v of steel plate, injection nozzle are to the distance H of steel plate.
After the hot-rolled steel sheet that obtains is cooled to room temperature, by measuring the mean thickness of oxide skin with the described same method of Fig. 1, Fig. 2, and near each steel band length direction central authorities, the position of width 1/4, press method each 5 local surface roughness Ra of measuring on length direction and width of JIS B0601 defined, will obtain surface roughness Ra after its weighted mean.In addition, will until time that oxide skin is peeled off in 20% hydrochloric acid (50 ℃) fully as the pickling time.In addition, investigation is with it is cold rolling (draft 75%, 0.7mm thick).Material after the tempering (800 ℃, 60 seconds continuous tempering).These results are shown in Table 1 in the lump.
Clearly visible from table 1, any hot-rolled steel sheet constructed in accordance all have average scale thickness in the thin oxide skin below the 4 μ m, surface roughness Ra below 0.8 μ m, and pickling is good, the material after it is cold rolling also is good.
Table 1
| Roughing finish temperature (℃) | Condition descales | To the time (second) that finish rolling begins | Surface roughness Ra (μ m) | The proterties of oxide skin | The mechanical properties of cold-rolled steel sheet | Appendix | ||||||
| Average oxidation skin depth (μ m) | The pickling time (second) | |||||||||||
| Outlet pressure (kgf/cm 2) | Jet pressure (kgf/cm 2) | Water yield density (l/cm 2) | ??????YS ???(kgf/mm 2) | ?????TS ?(kgf/mm 2) | Unit elongation (%) | Average r value | ||||||
| ????980 | ????550 | ?????29.5 | ???0.0024 | ?????2.3 | ????0.62 | ????3.5 | ????35 | ?????16.3 | ????30.7 | ???49.1 | ???1.78 | Example |
| ????995 | ????620 | ?????33.3 | ???0.0024 | ?????3.7 | ????0.71 | ????3.1 | ????30 | ?????17.1 | ????30.5 | ???48.7 | ???1.75 | Example |
| ????965 | ????600 | ?????32.2 | ???0.0024 | ?????4.8 | ????0.53 | ????2.8 | ????27 | ?????17.0 | ????30.5 | ???48.6 | ???1.71 | Example |
| ????940 | ????500 | ?????26.8 | ???0.0024 | ?????4.8 | ????0.87 | ????4.8 | ????51 | ?????16.5 | ????30.6 | ???48.8 | ???1.80 | Comparative example |
| ????1020 | ????530 | ?????28.4 | ???0.0024 | ?????5.0 | ????1.03 | ????5.0 | ????63 | ?????16.7 | ????30.5 | ???49.5 | ???1.83 | Comparative example |
| ????963 | ????465 | ?????24.9 | ???0.0025 | ?????4.2 | ????1.25 | ????7.3 | ????108 | ?????16.5 | ????30.4 | ???48.9 | ???1.75 | Comparative example |
| ????985 | ????590 | ?????31.7 | ???0.0018 | ?????2.9 | ????0.91 | ????5.5 | ????72 | ?????17.0 | ????30.3 | ???48.8 | ???1.78 | Comparative example |
| ????970 | ????620 | ?????33.3 | ???0.0020 | ?????3.3 | ????0.78 | ????3.5 | ????45 | ?????16.8 | ????31.0 | ???49.5 | ???1.78 | Example |
| ????970 | ????600 | ?????32.2 | ???0.0023 | ?????5.3 | ????0.75 | ????6.9 | ????103 | ?????17.2 | ????30.7 | ???49.1 | ???1.81 | Comparative example |
Embodiment 2
The plate slab that will contain the heavy % of C:0.08, the heavy % of Si:0.01, the heavy % of Mn:0.51, the heavy % of P:0.011, the heavy % of S:0.008, the heavy % of sol.Al:0.04, the heavy % of N:0.004 is heated to after 1200 ℃, carry out roughing by all temps shown in the table 2, make the thin slab of 35mm, then in finish rolling, carry out 92% depress, make 2.8mm, finish finish rolling (Ar at 875 ℃
3=850 ℃).Coiling temperature is 610 ℃.At this moment, make the condition of descaling, the back that descales to the time that finish rolling begins such variation as shown in table 2.
After resulting hot-rolled steel sheet is cooled to room temperature, similarly to Example 1, investigation scale thickness, surface roughness Ra (μ m), it the results are shown in the table 2.Here, will until time that oxide skin is peeled off in 20% hydrochloric acid (50 ℃) fully as the pickling time.
Table 2 clearly illustrates that the average scale thickness of any hot-rolled steel sheet constructed in accordance is below 4 μ m, and also below 0.8 μ m, pickling is also good for surface roughness Ra.
Table 2
| Roughing finish temperature (℃) | Condition descales | To the time (second) that finish rolling begins | Surface roughness Ra (μ m) | The proterties of oxide skin | The mechanical properties of cold-rolled steel sheet | Appendix | |||||
| Average oxidation skin depth (μ m) | The pickling time (second) | ||||||||||
| Outlet pressure (kgf/cm 2) | Jet pressure (kgf/cm 2) | Water yield density (l/cm 2) | ???????YS ???(kgf/mm 2) | ???????TS ???(kgf/mm 2) | Unit elongation (%) | ||||||
| ??945 | ????550 | ????29.5 | ????0.0024 | ?????2.3 | ????0.61 | ????3.5 | ????36 | ?????24.7 | ?????36.5 | ????47.5 | Example |
| ??940 | ????620 | ????33.3 | ????0.0024 | ?????3.6 | ????0.72 | ????3.2 | ????31 | ?????25.2 | ?????37.5 | ????47.1 | Example |
| ??925 | ????600 | ????32.2 | ????0.0024 | ?????4.9 | ????0.48 | ????2.9 | ????25 | ?????26.1 | ?????37.3 | ????46.3 | Example |
| ??890 | ????500 | ????26.8 | ????0.0024 | ?????4.8 | ????0.89 | ????4.8 | ????53 | ?????25.7 | ?????36.4 | ????45.9 | Comparative example |
| ??980 | ????530 | ????28.4 | ????0.0025 | ?????5.3 | ????1.11 | ????5.1 | ????64 | ?????24.3 | ?????37.0 | ????46.3 | Comparative example |
| ??945 | ????460 | ????24.7 | ????0.0025 | ?????4.3 | ????1.24 | ????7.5 | ????111 | ?????25.5 | ?????36.9 | ????47.5 | Comparative example |
| ??955 | ????590 | ????31.7 | ????0.0017 | ?????2.9 | ????0.90 | ????5.4 | ????73 | ?????25.6 | ?????37.0 | ????47.1 | Comparative example |
| ??950 | ????620 | ????33.3 | ????0.0021 | ?????3.4 | ????0.78 | ????3.4 | ????45 | ?????24.7 | ?????38.0 | ????46.9 | Example |
| ??930 | ????600 | ????32.2 | ????0.0023 | ?????5.5 | ????0.74 | ????6.8 | ????105 | ?????26.4 | ?????37.7 | ????46.2 | Comparative example |
| ??940 | ????680 | ????63.4 | ????0.0028 | ?????3.2 | ????0.62 | ????2.7 | ????24 | ?????26.5 | ?????39.5 | ????47.2 | Example |
Embodiment 3
After will being heated to 1200 ℃ by each plate slab that composition in the table 3 constitutes, roughing becomes the thin slab of 35mm, then descales, and applies 90% the finish rolling of depressing and making 3.5mm.Respectively create conditions and be shown in table 4 in the lump.
After resultant hot-rolled steel sheet is cooled to room temperature, similarly to Example 1, measure scale thickness, surfaceness and pickling time.Its result is shown in Table 4 in the lump.
Table 3 and table 4 clearly illustrate that the average oxidation skin depth of any hot-rolled steel sheet constructed in accordance is below 4 μ m, and surfaceness is below 0.8 μ m, and pickling is good.
Table 3
| ??No | Cheng Fen Group becomes (heavy %) | |||||||||
| ????C | ????Si | ????Mn | ????P | ????S | ??sol.Al | ????N | ????Ti | ????Nb | ????B | |
| ??1 | ???0.0027 | ???0.46 | ???1.20 | ???0.060 | ??0.006 | ???0.05 | ??0.0028 | ???0.05 | ?????- | ??0.0026 |
| ??2 | ???0.0025 | ???0.02 | ???0.16 | ???0.008 | ??0.008 | ???0.05 | ??0.0025 | ???0.06 | ?????- | ????- |
| ??3 | ???0.0021 | ???0.02 | ???0.17 | ???0.007 | ??0.009 | ???0.04 | ??0.0031 | ???0.05 | ????0.006 | ????- |
| ??4 | ???0.0026 | ???0.01 | ???0.12 | ???0.009 | ??0.012 | ???0.06 | ??0.0032 | ????- | ????0.04 | ????- |
| ??5 | ???0.0300 | ???0.01 | ???0.15 | ???0.008 | ??0.014 | ???0.04 | ??0.0027 | ????- | ?????- | ??0.0021 |
| ??6 | ???0.0027 | ???0.01 | ???0.14 | ???0.006 | ??0.008 | ???0.07 | ??0.0026 | ???0.06 | ?????- | ??0.0011 |
| ??7 | ???0.0021 | ???0.02 | ???0.16 | ???0.008 | ??0.006 | ???0.06 | ??0.0028 | ????- | ????0.03 | ??0.0008 |
| ??8 | ???0.0019 | ???0.01 | ???0.15 | ???0.008 | ??0.008 | ???0.05 | ??0.0029 | ???0.04 | ????0.008 | ??0.0012 |
Table 4
| ??No | Roughing finish temperature (℃) | Condition descales | To the time (second) that finish rolling begins | The finish rolling condition | Coiling temperature (℃) | Surface roughness Ra (μ m) | The proterties of oxide skin | Appendix | ||||
| Average oxidation skin depth (μ m) | The pickling time (second) | |||||||||||
| Outlet pressure (kgf/cm 2) | Jet pressure (kgf/cm 2) | Water yield density (l/cm 2) | Finish temperature (℃) | ???Ar 3??(℃) | ||||||||
| ??1 | ????950 | ????550 | ????27.9 | ???0.0024 | ????4.1 | ????910 | ????880 | ????630 | ????0.62 | ????3.9 | ????46 | Example |
| ??2 | ????970 | ????540 | ????27.1 | ???0.0026 | ????4.4 | ????920 | ????900 | ????670 | ????0.74 | ????3.8 | ????35 | Example |
| ??3 | ????960 | ????600 | ????30.1 | ???0.0025 | ????4.2 | ????915 | ????905 | ????550 | ????0.75 | ????3.8 | ????34 | Example |
| ??4 | ????980 | ????620 | ????31.1 | ???0.0021 | ????4.5 | ????915 | ????905 | ????660 | ????0.78 | ????3.7 | ????36 | Example |
| ??5 | ????930 | ????610 | ????30.6 | ???0.0021 | ????3.8 | ????870 | ????860 | ????640 | ????0.66 | ????3.2 | ????30 | Example |
| ??6 | ????950 | ????580 | ????29.1 | ???0.0026 | ????3.9 | ????910 | ????890 | ????650 | ????0.72 | ????3.8 | ????35 | Example |
| ??7 | ????970 | ????590 | ????29.6 | ???0.0021 | ????4.2 | ????915 | ????900 | ????630 | ????0.70 | ????3.7 | ????32 | Example |
| ??8 | ????980 | ????610 | ????30.6 | ???0.0027 | ????3.6 | ????925 | ????910 | ????600 | ????0.63 | ????3.6 | ????33 | Example |
Utilize possibility on the industry
As mentioned above, hot rolled steel plate of the present invention is being in that hot-rolled state (band casting skin) is adding man-hour because thin thickness and the adaptation of oxide skin are good as supplying with, thus peel off few, in addition, the surface quality of the good excellence of pickling when having as pickling.
In addition, manufacturing method according to the invention by using super-pressure in the hot-rolled process technology that descales, can be made hot rolled steel plate extremely effectively.
Thereby the present invention also cuts much ice to hot rolled steel plate being used as the productivity of the various goods such as raw-material cold-rolled steel sheet or surface treated steel plate and the raising of economy except to the hot rolled steel plate.
Claims (6)
1, a kind of hot-rolled steel sheet is characterized in that, it contains:
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
All the other compositions are the steel constituent that Fe and unavoidable impurities constitute, and it is the following oxide skins of 4 μ m that the surface has mean thickness, and surface roughness Ra is below the 0.8 μ m.
2, a kind of hot-rolled steel sheet is characterized in that, it contains:
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And contain a kind or two kinds
The heavy % of Ti:0.10 is following, Nb:0.10 weighs below the %
All the other compositions are the steel constituent that Fe and unavoidable impurities constitute, and it is the following oxide skins of 4 μ m that the surface has mean thickness, and surface roughness Ra is below the 0.8 μ m.
3, a kind of hot-rolled steel sheet is characterized in that, it contains:
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And, contain
Below the heavy % of B:0.0100
All the other compositions are the steel constituent that Fe and unavoidable impurities constitute, and it is the following oxide skins of 4 μ m that the surface has mean thickness, and surface roughness Ra is below the 0.8 μ m.
4, a kind of hot-rolled steel sheet is characterized in that, it contains:
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And, contain a kind or 2 kinds
The heavy % of Ti:0.10 is following, Nb:0.10 weighs below the %
Also contain
Below the heavy % of B:0.0100
All the other compositions are the steel constituent that Fe and unavoidable impurities constitute, and it is the following oxide skins of 4 μ m that the surface has mean thickness, and surface roughness Ra is below the 0.8 μ m.
5, a kind of manufacture method of hot-rolled steel sheet is characterized in that and will contain
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
All the other compositions are that the steel raw material of Fe and unavoidable impurities is heated to Ac
3After point is above, at (Ar
3Point+100 ℃)～(Ar
3Point+50 ℃) finish roughing in the temperature range, then, satisfying jet pressure is 25kgf/cm
2More than and liquid measure density be 0.002 liter/cm
2The ultra-high voltage of above condition descales, then, 5 seconds with interior beginning draft be more than 80%, the rolling temperature of finishing is at Ar
3The finish rolling that point is above then, is being batched below 700 ℃.
6, a kind of manufacture method of hot-rolled steel sheet is characterized in that and will contain
The heavy % in the heavy % in C:0.001～0.20, Si:0.01～0.50
Below the heavy % of heavy %, P:0.05 of Mn:0.05～2.0
The heavy % of S:0.05 is following, the heavy % in sol.Al:0.01～0.10
Below the heavy % of N:0.020
And, contain from
The heavy % of Ti:0.10 is following, Nb:0.10 weighs below the %
Below the heavy % of B:0.0100
In select more than a kind or 2 kinds, all the other compositions are that the steel raw material of Fe and unavoidable impurities is heated to Ac
3After point is above, at (Ar
3Point+100 ℃)～(Ar
3Point+50 ℃) finish roughing in the temperature range, then, satisfying jet pressure is 25kgf/cm
2More than and liquid measure density be 0.002 liter/cm
2The ultra-high voltage of above condition descales, then, 5 seconds with interior beginning draft be more than 80%, the rolling temperature of finishing is at Ar
3The finish rolling that point is above then, is being batched below 700 ℃.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22287495A JP3390584B2 (en) | 1995-08-31 | 1995-08-31 | Hot rolled steel sheet and method for producing the same |
| JP222874/1995 | 1995-08-31 | ||
| JP222874/95 | 1995-08-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1164875A true CN1164875A (en) | 1997-11-12 |
| CN1067444C CN1067444C (en) | 2001-06-20 |
Family
ID=16789249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96190986A Expired - Lifetime CN1067444C (en) | 1995-08-31 | 1996-08-30 | Hot-rolled steel sheet and process for producing the same |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5853503A (en) |
| EP (1) | EP0789090B1 (en) |
| JP (1) | JP3390584B2 (en) |
| KR (1) | KR100259403B1 (en) |
| CN (1) | CN1067444C (en) |
| CA (1) | CA2203996C (en) |
| DE (1) | DE69632025T2 (en) |
| WO (1) | WO1997008355A1 (en) |
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-
1995
- 1995-08-31 JP JP22287495A patent/JP3390584B2/en not_active Expired - Fee Related
-
1996
- 1996-08-30 DE DE69632025T patent/DE69632025T2/en not_active Expired - Lifetime
- 1996-08-30 KR KR1019970702741A patent/KR100259403B1/en not_active IP Right Cessation
- 1996-08-30 WO PCT/JP1996/002455 patent/WO1997008355A1/en active IP Right Grant
- 1996-08-30 US US08/817,947 patent/US5853503A/en not_active Expired - Fee Related
- 1996-08-30 CA CA002203996A patent/CA2203996C/en not_active Expired - Fee Related
- 1996-08-30 CN CN96190986A patent/CN1067444C/en not_active Expired - Lifetime
- 1996-08-30 EP EP96928718A patent/EP0789090B1/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
|---|---|
| WO1997008355A1 (en) | 1997-03-06 |
| KR970707312A (en) | 1997-12-01 |
| DE69632025D1 (en) | 2004-05-06 |
| CN1067444C (en) | 2001-06-20 |
| CA2203996C (en) | 2001-01-23 |
| EP0789090B1 (en) | 2004-03-31 |
| US5853503A (en) | 1998-12-29 |
| CA2203996A1 (en) | 1997-03-06 |
| EP0789090A1 (en) | 1997-08-13 |
| DE69632025T2 (en) | 2004-08-05 |
| KR100259403B1 (en) | 2000-06-15 |
| JP3390584B2 (en) | 2003-03-24 |
| JPH0967649A (en) | 1997-03-11 |
| EP0789090A4 (en) | 1998-08-26 |
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